Alien Breed

Several levels feature an alarm and countdown for you to make it to an objective. The countdowns are impossible to miss with their red lights and computer voiced notification. You must kill fifty enemies during a single countdown. Some of the later levels, particularly Valiance Level 3 - Engineering Core and Synergy Level 1 - Shuttle Bay 3, have longer timers which will help you reach your total. The countdown ends when you reach your goal, but you don't need to end the countdown to earn the trophy. Rather than head to the goal, you may prefer to head to areas where enemies spawn more frequently.